KR20080105938A - Press-fitting device and control method thereof for a press machine - Google Patents

Abstract

A press-fit control device and method of a press machine are provided to reduce failure rate by determining the completion of press-fitting accurately based on the fitting spot. A press-fit control method of a press machine is as follows. One or more data are detected among load, location and time relating to press-fit(S100). Whether the detected data value meet the set data start value is determined(S200). If satisfied, press-fit control is performed(S300). Sampling is performed at regular time intervals after starting the control(S400). Whether there is a change as much as a control sample number set up about sampling and a control load gradient is determined(S700). If data gradient has changed, the operation is stopped.

Description

 Press-fitting device and control method according to press device and control method thereof

1 is a view schematically showing the overall configuration of a press-fit control apparatus according to the present invention.

2 is a configuration diagram schematically showing a configuration of a control unit of the indentation control apparatus according to the present invention.

3 is a flow chart of the indentation control method according to the present invention

4 is a table relating to a crimp point control setting item and a control description.

5 is a table relating to load control setting items.

6 is a position-load graph.

7 is a load-position display item.

* Brief description of drawing symbols *

100: press body 200: rod

300: drive means 400: microcomputer

500: input means

The present invention relates to a press-fitting control device of the press apparatus and a control method thereof, and more particularly, to a press-fitting control device and a press-fitting control method for press-fitting and assembling the press-fitted object to the press-fitted object, Provided are a press-fitting control device and a press-fitting control method of a press apparatus for checking the state and preventing deformation of the press-fitted material or the press-fitted material due to excessive pressurization.

Background Art In general, a device for fitting a press-fitted object such as a precision shaft, a pin, a bearing, or the like to a press-fitted object such as a shaft hole, a pin hole, a bearing bore, that is, a press-fitting device, is widely known.

In order to increase the precision of the press-fitting operation, when the press-fit is press-fitted into the press-fitted object, machining tolerances exist in the inner diameter and the outer diameter of the press-fitted part, and machining tolerances also exist in the hole depth of the press-fitted object and the height of the press-fitted material. Machining errors had to be taken into account.

In this press-fitting operation, in order to press-fit the press-fitted material to the press-fitting surface of the press-fitted object, the press-fitting load has been used and a depth tolerance is set and sensed.

Referring to the conventional indentation operation in detail as follows.

Each of the indented material and the indented material may have a height machining tolerance, an inner diameter tolerance, or an outer diameter tolerance. There is also a deformation tolerance of the indentation reference plane due to the indentation.

In conventional press operations, after indentation is sampled, the indentation load may be indented beyond the maximum load of the indentation, thereby causing deformation or breakage of the indented object or the indentation. In addition, when press-fitting at the highest load and the height is within a predetermined range, it has been determined that the press-in has been completed, the press-in method of determining that the press-in is good.

However, in this conventional method, the indentation load changes according to the inner diameter of the indented material or the outer diameter of the indented object, and the indentation depth also has a tolerance, so that even if the indentation load is reached and the indentation depth is actually reached, No case occurred.

In addition, when such a phenomenon occurs, in order to detect the complete indentation, the indentation depth is used as a measuring sensor in the reference plane of the object to be inserted. There was a problem that the indentation is not detected.

In addition, while the area monitoring is performed by setting the load area for the indentation depth during the indentation of the indented material, this could not be confirmed within the processing tolerance since it is possible only at the minimum position of the indentation depth.

Therefore, in the indentation control apparatus and the indentation control method according to the present invention, in press-fitting the press-fitted object with the processing tolerances present, the press-fit of the press-fit is precisely determined at the point where the press-fit is pressed on the pressed surface of the press-fitted material. It is possible to drastically reduce the quality defects by treating them, and to provide an indentation control device and an indentation control method that can reduce the capital investment because there is no need to install a separate measurement system for non-indentation detection. have.

Another object of the present invention is to provide an indentation control device and an indentation control method capable of preventing deformation or breakage of a material by not indenting the indentation load above the maximum indentation load to prevent unindentation during indentation.

In order to achieve the above object, the present invention is a press-fit control device for press-fitting the press-fitted object to the object to be pressed in the press system, the press body; A rod provided on the lower end of the press body to be movable up and down; Driving means provided at an upper inner side of the press body to drive the rod; Position detecting means for detecting the press-fitting position of the press-fitted object with respect to the press-fitted object according to the distance of the rod provided in the press main body; Load detection means for detecting a load of a rod that is provided in the press body and is press-fitted; And control means for determining and controlling the indentation state of the indented material in accordance with the signals provided by the position determining means and the load determining means.

The present invention also detects a load associated with indentation and one or more data of position and time data; Determine whether the detected data value satisfies all of the given data start set values; If all data start setting values are satisfied, indentation control is executed; After start of control, continuously sampling at a predetermined predetermined interval; Determining whether there is a variation by the control sample number and the control load gradient set for the sampling; Provided is a press-fit control method that stops operation when there is a change in the data gradient.

If there is no change in the data gradient, it is determined whether the final upper limit position or the crimping point final upper limit load is reached, and when the final upper limit position or the crimping point final upper limit load is reached, the operation is stopped.

Here, the initial point where the gradient is started is referred to as a crimping point, and it is determined whether the value generated by the crimping point is within the range set in the crimping point control setting item to determine the indentation state of the indented material.

When the indentation load is equal to or greater than a predetermined final upper limit load, the indentation control is stopped.

The above objects, features and advantages will become more apparent from the following detailed description taken in conjunction with the accompanying drawings. Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The present invention is a press-fit control device for press-fitting the press-fitted object in the press system, Figure 1 schematically shows the overall configuration of the press-fit control device according to the present invention, Figure 2 is a press-fit according to the present invention It is a block diagram which shows the structure of the control part of a control apparatus schematically.

As shown in the figure, the press main body 100; A rod 200 which is provided to be movable up and down at a lower end of the press main body 100 to press-fit a press-fit (not shown) to the press-fit (not shown); Driving means (300) provided at an upper inner side of the press body (100) to drive the rod (200); Position detecting means for detecting the indentation position of the indentation with respect to the indentation object according to the distance of the rod 200 which is provided in the press main body 100; Load detecting means for detecting a load of a rod that is provided in the press main body 100 and press-fitted; And control means for determining and controlling the indentation state of the indented material in accordance with the signals provided by the position determining means and the load determining means.

The control means includes a central processing unit (CPU) functioning as a microcomputer 400, a drive for driving an A / D converter, a memory for temporarily storing various data or calculation results, a driving unit, and the like (drive circuit). It is provided. Then, the indentation control is executed based on the condition grasped from the detection signal or the like from each detection means.

The control means may be configured to set an indentation position and an indentation load setting value according to data of the indentation object and the indentation object through a user for indentation control based on data on the indentation object and the indentation object, or an input means for data management ( And a monitor means 600 for displaying the indentation control state to the user when executing the indentation control by the control means. In addition, although not shown in Figure 1, it further includes a communication means for communicating with the central processing unit.

In FIG. 1, the input means 500 and the monitor means 600 are shown in separate configurations, but data input and monitoring may be integrally possible in one configuration.

The driving means is composed of a servo motor and a reducer, the position detecting means is an encoder for checking the position of the indented material, and the load detecting means is composed of a load cell for detecting the indenting load.

Accordingly, the control means controls the servomotor, checks the position of the indentation according to the signal of the encoder, and detects the load according to the signal of the load cell to perform arithmetic processing to control the indentation of the indentation.

2 is a schematic configuration diagram of a control unit according to the control means, and largely includes an external input / output unit, a control controller unit, and an external servo press unit.

Specifically, 1 is a three-phase 220V AC power input as a main power input, 2 is a single-phase 220V AC power input as a control power supply, and supplies DC power required for internal circuitry. 3 is a DC power source, which converts a three-phase 220V AC power source into a DC power source required to drive a motor. 4 is a servo driver to apply a drive voltage to the motor three phases using a 320V DC power supply. 5 is an AC servo motor and incremental encoder. 6 is a central processing unit of the servo driver which is a CPU and performs various associative and I / O processing and communication. 7 is a RAM to store the press pressure measurement value and position data of the load cell. 8 is an EEPROM for storing parameters, programs, and the like. 9 is an A / D converter that converts analog values of motor current, load cell output, and DC voltage sensor output to digital. 10 is a voltage sensing unit that converts a 320V DC voltage into an A / D converter input range. 11 is a motor current sensing unit that measures the current in the U-phase and W-phase of the motor and converts it into the A / D converter input range. 12 is an amplifier which converts the output voltage of the load cell into the A / D converter input range. 13 is a load cell which converts the pressure of the servo press into a voltage output. 14 is a master amplifier that converts the output voltage of the master load cell to the A / D converter input range. 15 is a master load cell to convert the pressure of the servo press into a voltage output. 16 is an encoder input unit which processes the encoder A, B, and Z phase outputs to the CPU. 17 is a communication unit and an RS232 communication unit with a PC. 18 is I / 0, which is a sensor input and an IN / OUT interface unit with a PLC.

The press-fitting control device according to the present invention configured as described above sets the pre-indentation position and the indentation load set value given in advance through the input means 500 with respect to the indentation object and the indentation object. Sampling is performed based on the indentation position and the indentation load detected by the load detection means, and the indentation control is executed while the sampled value is computed with a predetermined value and confirmed through a monitor.

Specifically, the sampling number of the sampled value can be set by the user, but in general, it is determined whether or not the sampling value through two samplings fluctuates by the set value, and performs indentation control such as stopping the indentation operation.

Here, in performing the indentation control, the indentation control may be performed by setting time data according to the time of the indentation instead of or in combination with the indentation position data.

Next, the press-fit control method according to the present invention will be described. The indentation control method of the present invention is according to the crimping point indentation method. Here, the crimp point refers to the hyper known point at which the gradient by the set value has started.

Indentation control method of the present invention can be made in a manner to control while monitoring the indentation load. A crimping point occurs at a predetermined load point through the position by the indentation position determining means and the load-specific data by the load determination means of the indentation.

Also, crimping point control is executed from the point where both the control start position and the control start load are satisfied. At this time, the control method is set by the control means in a separate window of the program load and position.

The control means determines whether the crimping point is within the setting range on the basis of a predetermined set value, that is, the set position, load, and number of time control samples.

Thereafter, the control means drives the driving motor based on the final upper limit load and the final distance of the crimping point, and the driving speed is driven at a predetermined set speed.

In this case, the sampling interval is specified when the time or position is set as time (for example, 1 msec, 5 msec. 10 msec .., etc.). When the distance is set, the sampling interval is set by specifying the sampling distance. .

Since the control unit gradient is set by two set control samples, the servo motor is immediately stopped at the point of time (inflection point) where the variation of the predetermined number of control unit gradients or more occurs for two samples. In other words, the press-in is stopped.

The control means stops the motor immediately when a predetermined crimping point final upper limit position or a crimping point final upper limit load is reached even when no inflection point occurs during the press fitting.

On the other hand, when the chip is contained in the inner compression portion, the load is squeezed while pressing the chip, so the indentation load increases, but the compression point is not found. At this time, it stops immediately at the set final upper limit load and no load point is found, causing a load over error.

In addition, since a crimping point error is generated at the same time, it is possible to easily determine whether the crimping point error or the crimping point is greater than the final load.

This indentation control method will be described with reference to the flowchart of FIG. 3.

In the process of press-fitting the indented material to be indented, the indentation load and the indentation position are detected through the indentation load detecting means and the indentation position detecting means (S100). It is determined whether the detected indentation load and the indentation position value satisfy all of the predetermined control start position and control start load setting value (S200). If all are satisfied in S200, control starts (S300), otherwise, the flow returns to step S100.

After the start of the control, the preset indentation load and the indentation position (or indentation time) data are sampled for a predetermined number of times (S400). After sampling, it is determined whether a value at which a crimping point occurs in a predetermined indentation load and indentation distance set value is within a set range (S500). If it is within the set range (Yes in S500), the driving point is driven based on the final upper limit load of the crimping point and the final upper limit of the crimping point (S600). If it is not within the setting range here (No in S500), the flow returns to step S300.

Thereafter, it is determined whether there is a change in the control unit gradient and the control distance gradient with respect to the sampling number (S700). In S700, for example, the operation is stopped. On the other hand, if No in S700, it is determined whether the final upper limit position or the final point of the compression point reached (S800). In the case of S800, the operation is stopped.

Next, an example performed in relation to the position-load data for the indentation control method executed by the present inventors will be described.

4 is a table relating to the crimp point control setting items and a control description, FIG. 5 is a table relating to the load control setting items, FIG. 6 is a position-load graph displayed on the monitor means, and FIG. 7 is displayed on the monitor means. Load-position display item.

In this embodiment, the number of sample points is 2, the load gradient is 90 kg, the control start position is 80.80, and the control start load is 200.

First, the crimping point control is started from the point when both the control start position and the control start load are satisfied, that is, the position is 80.80 and the load is 200 ((1) and (2) in FIG. 4). In other words, in Fig. 7, the operation starts from ① and it is determined whether there is a variation of the load gradient of 90 kg at the point ③ after the two points which are the number of control samples.

At this time, since it is not a change of 90 kg, the load variation amount of point ④ from point ② is determined again (see FIG. 7). At this time also, since it is not a change of 90 kg, it is continuously calculated in the above manner.

Here, the number of control samples ((3) in Fig. 4) is adjustable, and the samples are sampled by time or distance (this embodiment is taken as distance (position)). The sampling interval is also adjustable.

The control unit gradient (4 in Fig. 4) stops when an abnormal load variation occurs at the set number (two in the table), and calculates the initial sample position as the crimping point. That is, at the point # 2 (see FIG. 7) which is 2 points after the point #, it stops because 90 kg or more of variation (109 kg) occurred. At this time, it is determined that the first point to stop, the number 으로 as the crimping point. At that time, the upper limit and lower limit position-load of the crimping point are determined, and the upper limit and lower limit position-load of the end point is determined to determine whether to stop the operation.

In this press-fitting control, when press-fitting the press-fitted object with the processing tolerances present, the point of press-fitting of the press-fitted object is precisely determined at the point where the press-fit is pressed onto the pressurized surface of the press-fitted material, and the pressing process is completed. In addition, the cost of equipment can be reduced by eliminating the need for a separate measuring system for non-indentation detection. In order to prevent the non-indentation during press-in, there is no need to press-in the press-in load beyond the maximum press-in load, which prevents deformation or breakage of the material.

The present invention described above is not limited to the above-described embodiment and the accompanying drawings, and various substitutions, modifications, and changes are possible in the technical field of the present invention without departing from the technical spirit of the present invention. It will be clear to those of ordinary knowledge.

As described above, the indentation control device and the control method thereof according to the present invention can be completely in contact regardless of processing tolerances, and if incomplete contact is not possible, the indentation control unit can be discriminated in order to confirm a separate indentation at the production site. There is no need for measurement, and it is possible to determine whether the indentation is in close contact with the current measuring instrument.

In addition, the indentation load can be indented at the most appropriate load irrespective of the inner diameter of the hole or the inner diameter tolerance of the indented material, thereby reducing mechanical deformation such as deformation of the material or deformation of the reference plane, thereby reducing the material cost and increasing the life of the machine. Due to the reduction of maintenance costs due to the effect, there is no need for a separate indentation detection confirmation device (measurement, etc.) has the effect of reducing the initial investment cost.

Claims (5)

Detect a load associated with the indentation and one or more of position and time data; Determine whether the detected data value satisfies all of the given data start set values; If all data start setting values are satisfied, indentation control is executed; After start of control, continuously sampling at a predetermined predetermined interval; Determining whether there is a variation by the control sample number and the control load gradient set for the sampling; Stop operation when there is a change in the data gradient Indentation Control Method. The method of claim 1, If there is no change in the data gradient, it is determined whether the final upper limit position or the final point of the crimp point is reached. When the final upper limit position or crimping point final upper limit load is reached, the operation is stopped. Indentation Control Method. The method of claim 1, Determines the indentation state of the indentation by determining whether the value of the crimping point, which is the initial point at which the gradient is started, is within the range set in the preset crimping point control setting item. Indentation Control Method. The method of claim 1, When the indentation load is greater than or equal to a predetermined final upper limit load, the indentation control is stopped. Indentation Control Method. Press body; A rod provided on the lower end of the press body to be movable up and down; Driving means provided at an upper inner side of the press body to drive the rod; Position detecting means for detecting the press-fitting position of the press-fitted object with respect to the press-fitted object according to the distance of the rod provided in the press main body; Load detection means for detecting a load of a rod provided in the press body and press-fitted; And A press-fit in accordance with a signal provided by the position determining means and the load determining means Control means for determining and controlling the indentation state of the Indentation Control Device.

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